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A portable computer comprising a main body, and a display part connected
to the main body. The portable computer further comprises a pair of links
connecting the display part with the main body; a display hinge provided
between a first end of each link and the display part and pivotally
supporting the display part to allow the display part to tilt relative to
the pair of links; a main hinge provided between a second end of each
link and the main body and pivotally supporting the pair of links to
allow the pair of links to pivot relative to the main body; and a locking
unit provided in the link and the display part to lock and release the
tilt of the display part relative to the link member.

1. A portable computer comprising a main body, and a display part
connected to the main body, further comprising: a pair of links
connecting the display part with the main body; a display hinge provided
between a first end of each link and the display part and pivotally
supporting the display part to allow the display part to tilt relative to
the pair of links; a main hinge provided between a second end of each
link and the main body and pivotally supporting the pair of links to
allow the pair of links to pivot relative to the main body; and a locking
unit provided in the link and the display part to lock and release the
tilt of the display part relative to the link member.

2. The portable computer according to claim 1, wherein the pair of links
are parallel to each other and disposed at opposite sides of the display
part.

3. The portable computer according to claim 2, wherein the locking unit
comprises: a locking projection protruding from one of the links and the
display part; and a projection holder provided in one of the links and
elastically locked to and released from the locking projection.

4. The portable computer according to claim 3, wherein the locking
projection is provided in at least one of the pair of links, and the
projection holder is provided in the display part in relation to the
locking projection.

5. The portable computer according to claim 4, wherein the projection
holder comprises: a projection accommodating part formed in a lateral
side of the display part to allow the display part tilted relative to the
link to accommodate the locking projection; and a holding projection
elastically retracted in the projection accommodating part by contacting
the locking projection.

6. The portable computer according to claim 5, wherein the projection
accommodating part comprises: an opening in a back of the display part to
accommodate the locking projection; and an elastic member facing opposite
the opening and contacting the locking projection past the holding
projection so as to prevent noise from coming out.

7. The portable computer according to claim 6, wherein the locking
projection is placed adjacent to the second end of the link connected to
the main hinge, and the pair of projection accommodating parts are
provided symmetrically with respect to an axis of the display hinge in
relation to the locking projection, and selectively accommodate the
locking projection.

8. The portable computer according to claim 7, wherein the projection
holder comprises a spring elastically pushing the holding projection
outwardly from the display part, and the holding projection and the
spring are provided in at least one of the pair of projection
accommodating parts.

9. The portable computer according to claim 2, further comprising a
coupler coupled to the main hinge and rotating relative to the main body
integrally with the links, wherein an axis of the coupler is aligned with
an axis of the main hinge.

10. The portable computer according to claim 9, wherein the main hinge
comprises a second shaft member provided in the second end of each link,
the coupler and the main body, and the second shaft member comprises a
second shaft, a second shaft supporter having a first part rotatably and
frictionally connected to the second shaft and a second part connected to
the main body, and a second shaft coupling part extended from the second
shaft toward the coupler and integrally coupled to the coupler.

11. The portable computer according to claim 10, wherein the display hinge
comprises: a first shaft member having a first shaft, and a first shaft
supporter frictionally and rotatably connected to the first shaft and
connected to the first end of the link; and a first shaft supporting
bracket connected to the display part and integrally connected to the
first shaft.

12. The portable computer according to claim 11, wherein the link
comprises an outer cover forming an outer appearance, and an inner cover
coupled to the outer cover to form a cable accommodating space to
accommodate a cable electrically connecting the display part with the
main body, and the first shaft member and the second shaft member are
respectively formed with a first cable through-hole and a second cable
through-hole to allow the cable to pass therethrough.

13. The portable computer according to claim 1, wherein the main hinge is
provided between the second end of each link and a rear upper part of the
main body.

14. The portable computer according to claim 1, further comprising: at
least one magnet provided on an upper surface of the main body; and an
attaching part provided on at least one of a front and a back of the
display part and magnetically attached to the magnet.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from Korean Patent Application No.
2003-89206, filed on Dec. 10, 2003, in the Korean Intellectual Property
Office, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a portable computer. More
particularly, the present invention relates to a portable computer having
an improved structure to add convenience to a user's tablet operation.

[0004] 2. Description of the Related Art

[0005] Typically, a portable computer has to be easy to carry and handle.
Portable computers include laptop computers, notebook computers, palmtop
computers and the like, all of which are portable.

[0006] For example, a conventional portable computer, disclosed in U.S.
patent application No. 6,005,757, comprises a main body mounted with a
plurality of hardware components; a display part for displaying a picture
based on a video signal received from the main body; and a pair of links
provided between the main body and a lateral side of the display part.
Further, between the display part and the link is provided a first hinge
to allow the display part to tilt relative to the link. In addition,
between the link and the main body is provided a second hinge to allow
the link to pivot relative to the main body.

[0007] The display part utilizes touch-screen technology. The main body
comprises a main board mounted with a central processing unit (CPU), a
graphic chip, etc. inside, and an input unit such as a keyboard, a mouse,
etc. outside.

[0008] With this configuration, in the conventional portable computer, the
display part can be folded and opened relative to the main body, and
pivoted about the second hinge. For example, if an angle is 0.degree.
when the display part is folded onto the main body, the display part can
be opened at an angle of approximately 90.degree. and can be turned
upside down at an angle of 180.degree. to be exposed upward. Further, the
display part can tilt relative to the link, and pivot about the first
hinge. Thus, the display part can tilt relative to the link member and
the main body, so that a screen of the display part is exposed upward,
thereby making a tablet operation possible.

[0009] In the conventional portable computer, the first and second hinges
are provided to allow the display part to tilt relative to the main body,
but it is inconvenient because there is no locking structure to maintain
the display part and the main body in a fixed position.

[0010] Consequently, for convenience and a stablity of operation of the
portable computer, it is desireable to improve the structure of the first
and second hinges provided in the conventional portable computer.

SUMMARY OF THE INVENTION

[0011] Accordingly, it is an aspect of the present invention to provide a
portable computer having an improved structure for convenience and
stability when a display part is tilted.

[0012] Additional aspects and/or advantages of the invention will be set
forth in the description which follows.

[0013] The foregoing aspects of the present invention are achieved by
providing a portable computer comprising a main body, and a display part
connected to the main body. The portable computer further comprises a
pair of links connecting the display part with the main body; a display
hinge provided between a first end of each link and the display part and
pivotally supporting the display part to allow the display part to tilt
relative to the pair of links; a main hinge provided between a second end
of each link and the main body and pivotally supporting the pair of links
to allow the pair of links to pivot relative to the main body; and a
locking unit provided in the link and the display part to lock and
release the tilt of the display part relative to the link member.

[0014] According to an aspect of the invention, the pair of links may be
parallel to each other and disposed at opposite sides of the display
part.

[0015] According to another aspect of the invention, the locking unit may
comprise a locking projection protruding from one of the links and the
display part toward the other link; and a projection holder provided in
the other one and elastically locked to and released from the locking
projection.

[0016] According to a further aspect of the invention, the locking
projection may be provided in at least one of the pair of links, and the
projection holder may be provided in the display part in correspondence
to the locking projection.

[0017] According to yet another aspect of the invention, the projection
holder may comprise a projection accommodating part formed in a lateral
side of the display part to allow the display part tilted relative to the
link to accommodate the locking projection; and a holding projection
elastically retracted in the projection accommodating part by contacting
the locking projection.

[0018] According to still another aspect of the invention, the projection
accommodating part may comprise an opening in a back of the display part
to accommodate the locking projection; and an elastic member facing
opposite the opening and contacting the locking projection passed the
holding projection so as to prevent noise from coming out.

[0019] According to an aspect of the invention, the locking projection may
be placed adjacent to the second end of the link connected to the main
hinge, and the pair of projection accommodating parts may be provided
symmetrically with respect to an axis of the display hinge in
correspondence to the locking projection, to selectively accommodate the
locking projection.

[0020] According to another aspect of the invention, the projection holder
may comprise a spring elastically pushing the holding projection
outwardly from the display part, and the holding projection and the
spring may be provided in at least one of the pair of projection
accommodating parts.

[0021] According to still another aspect of the invention, the portable
computer further comprises a coupler coupled to the main hinge and
rotating relative to the main body integrally with the links, wherein an
axis of the coupler may be aligned with an axis of the main hinge.

[0022] According to yet another aspect of the invention, the main hinge
may comprise a second shaft member provided in the second end of each
link, the coupler and the main body, and the second shaft member
comprises a second shaft, a second shaft supporter having a first part
rotatably and frictionally connected to the second shaft and a second
part connected to the main body, and a second shaft coupling part
extended from the second shaft toward the coupler and integrally coupled
to the coupler.

[0023] According to an aspect of the invention, the display hinge may
comprise a first shaft member having a first shaft, and a first shaft
supporter frictionally and rotatably connected to the first shaft and
connected to the first end of the link; and a first shaft supporting
bracket connected to the display part and integrally connected to the
first shaft.

[0024] According to a further aspect of the invention, the link may
comprise an outer cover forming an outer appearance, and an inner cover
coupled to the outer cover to form a cable accommodating space to
accommodate a cable electrically connecting the display part with the
main body, and the first shaft member and the second shaft member may be
respectively formed with a first cable through hole and a second cable
through hole to allow the cable pass therethrough.

[0025] According to still another aspect of the invention, the main hinge
may be provided between the second end of each link and a rear upper part
of the main body.

[0026] According to an additional aspect of the invention, the portable
computer may further comprise at least one magnet provided on an upper
surface of the main body; and an attaching part provided on at least one
of a front and a back of the display part and magnetically attached to
the magnet.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] These and other aspects and advantages of the present invention
will become apparent and more readily appreciated from the following
description of embodiments thereof, taken in conjunction with the
accompany drawings of which:

[0028] FIG. 1 is a front perspective view of a portable computer according
to an embodiment of the present invention;

[0029] FIGS. 2 and 3 are rear perspective views of the portable computer
of FIG. 1;

[0030] FIG. 4 is a partially exploded perspective view of a display part
in the portable computer according to an embodiment of the present
invention;

[0031] FIGS. 5 through 7 are sectional views illustrating operations of a
locking unit in the portable computer according to an embodiment of the
present invention;

[0032] FIGS. 8 through 11 are side views illustrating tilts of the display
part in the portable computer according to an embodiment of the present
invention; and

[0033] FIGS. 12 through 14 are exploded perspective views of the display
part and a link in the portable computer according to an embodiment of
the present invention.

[0034] Throughout the drawing figures, it should be understood that like
reference numerals refer to like features and structures.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Reference will now be made in detail to the embodiments of the
present invention, examples of which are illustrated in the accompanying
drawings.

[0036] As shown in FIGS. 1 through 4, a portable computer according to an
embodiment of the present invention comprises a main body 101 mounted
with a plurality of hardware components; a display part 110 for
displaying a picture based on a video signal received from the main body
101; a pair of links 120 each having a first end hingedly connected to
the main body 101 and a second end hingedly connected to the display part
110 (see FIG. 4); a display hinge provided between the first end of each
link 120 and the display part 110 and pivotally supporting the display
part 110 to allow the display part 110 to tilt relative to the pair of
links 120; a main hinge provided between the second end of each link 120
and the main body 101 and pivotally supporting the pair of links 120 to
allow the pair of links 120 to pivot relative to the main body 101; and a
locking unit 200 provided in the link 120 and the display part 110 to
lock and release the tilt of the display part 110 relative to the link
member 120. The portable computer according to an embodiment of the
present invention further comprises a coupler 180 coupled to the main
hinge and adapted to rotate relative to the main body 101 integrally with
the links 120, wherein a rotating axis of the coupler 180 is aligned with
a pivoting axis of the link 120.

[0037] The main body 101 comprises a main board (not shown) mounted with a
central processing unit (CPU), a graphic chip, etc. thereinside, and an
input unit such as a keyboard 103, a touch pad 104, etc. thereoutside.
The main body 101 is electrically connected to the display part 110 by a
cable 107 and transmits/receives a predetermined signal to/from the
display part 110 through the cable 107. Preferably, the cable 107
comprises a first cable through which a digital signal and a power signal
are transmitted, and a second cable through which an antenna signal and a
switch signal are transmitted.

[0038] Between the main body 101 and the display part 110 is provided a
holding part to prevent the display part 110 from being unintentionally
opened relative to the main body 101 when the display part 110 is folded
onto the main body 101. Preferably, the holding part comprises at least
one magnet 190 provided on an upper surface of the main body 101, and
attaching parts 191 and 193 provided on at least one of a front cover 112
and a rear cover 113 of the display part 110 and to which the magnets 190
are attached magnetically. However, the holding part may comprise a hook
(not shown) provided in at least one of the main body 101 and the display
part 110, and a hook holder (not shown) provided in the other one of the
main body 101 and the display part 110 and releasably engaged with the
hook.

[0039] Preferably, a pair of magnets 190 are provided on the upper surface
of the main body 101 at left and right sides. Further, a pair of
attaching parts 191 and 193 are preferably provided on the front cover
112 and rear cover 113 of the display part 110 respectively, so that the
magnets 190 can magnetically attach to the attaching parts 191 and 193.
Here, the attaching parts 191 and 193 are preferably made of a
magnetizable material to be attached to the magnet 190.

[0040] The display part 110 utilizes a touch-screen technology, so that
the display part 110 permit tablet operation with a stylus pen. The
display part 110 comprises a liquid crystal display (LCD) panel 111 for
displaying a picture based on the video signal received from the main
body 101, and the front and rear covers 112 and 113 connected to each
other across the LCD panel 111 and supporting the LCD panel 111 at front
and rear sides.

[0041] The front cover 112 is provided with a first attaching part 191 for
attachment to the magnet 190 of the main body 101 at a closed position
allowing the front cover 112 to be in contact with the upper surface of
the main body 101. Further, the rear cover 113 is provided with a second
attaching part 193 to be attached to the magnet 190 of the main body 101
at a tablet position allowing the rear cover 113 to be in contact with
the upper surface of the main body 101.

[0042] The coupler 180 is aligned with a second hinge axis 197 (to be
described later), and couples the pair of links 120 to each other. That
is, the coupler 180 supports the pair of links 120 to be pivoted relative
to the main body 101 at the same time when the display part 110 tilts
relative to the main body 101. Further, the coupler 180 is placed in a
rear upper part of the main body 101, so that the portable computer can
have a slim structure. The coupler 180 is preferably shaped like a pipe
having a circular section to be resistant to torsion. However, the
coupler 180 may have a polygonal section such as a rectangular section.

[0043] As shown in FIGS. 12 through 14, the links 120 are parallel to each
other and disposed at opposite sides of the display part 110. Further,
the links 120 tiltably connect the display part 110 to the main body 101,
so that the display part 110 can tilt among the closed position (refer to
FIG. 8) that the front cover 112 is in contact with the upper surface of
the main body 101, an opened position (refer to FIGS. 9 and 10) that the
display part 110 is opened relative to the main body, and the tablet
position (refer to FIG. 11) that the rear cover 113 is in contact with
the upper surface of the main body 101. Here, each link 120 comprises an
outer cover 130 forming an outer appearance, and an inner cover 140
coupled to the outer cover 130 to form a cable accommodating space.

[0044] The outer cover 130 has a first end 131 being bent outward, and a
second end 132 being bent inward. Further, the outer cover 130 is
provided with thereinside a plurality of bosses 133 to be fastened with
coupling holes 146 of the inner cover 140 by first screws 134.

[0045] The inner cover 140 has a first end 141 being bent outward
corresponding to the first end 131 of the outer cover 130, and a second
end 142 being bent inward corresponding to the second end 132 of the
outer cover 130. Further, the first end 141 of the inner cover 140 is
formed with a first hinge hole 144 to which a first shaft 151 of the
first shaft member 150 is rotatably inserted. Further, the second end 142
of the inner cover 140 is formed with an extended part 143 having a
second hinge hole 145 to which a second hinge shaft 171 of a second shaft
member 170 is rotatably inserted. Further, the inner cover 140 is formed
with the plurality of coupling holes 146 corresponding to the plurality
of bosses 133 of the outer cover 130 and fastened with the bosses 133 by
the first screws 134.

[0046] The display hinge is provided between the display part 110 and the
link 120 and allows the display part 110 to tilt relative to the link
120. Further, the display hinge comprises the first hinge hole 144 of the
inner cover 40, the first shaft member 150 having the first shaft 151 to
be rotatably inserted in the first hinge hole 144, and a first shaft
supporting bracket 160 connected to the rear cover 113 and supporting the
first shaft 151 rotatably inserted in the first hinge hole 144.

[0047] The first shaft member 150 comprises a first shaft supporter 155
disposed between the first end 141 of the inner cover 140 and the first
end 131 of the outer cover 130, the first shaft 151 being rotatably
connected to the first shaft supporter 155 and protruding toward the rear
cover 113, a first cable through hole 152 formed in the first shaft
member 150 along a lengthwise direction of the first shaft 151 to allow
the cable 107 to pass therethrough, and a pair of connection part 153
extended from opposite sides of the first shaft supporter 155 and
connected to the first end 141 of the inner cover 140 and the first end
131 of the outer cover 130 by screws.

[0048] The first shaft 151 has a first end rotatably and frictionally
connected to the first shaft supporter 155, and a second end which is
forcibly fitted in a first shaft hole 161 of the first shaft supporting
bracket 160 connected to the display part 110 and rotates integrally with
the first shaft supporting bracket 160. That is, the first end of the
first shaft 151 is rotatably and frictionally fitted to the first shaft
supporter 155, and therefore a force large enough to overcome a
predetermined friction is needed to tilt the display part 110 relative to
the link 120. Preferably, such predetermined friction is large enough to
prevent the display part 110 from tilting relative to the link 120 by the
weight of the display part 110 and to allow a user to easily tilt the
display part 110 relative to the link 120. Thus, the display part 110 can
tilt about a first hinge axis 196 (see FIG. 10) formed by the first shaft
151.

[0049] The first shaft supporting bracket 160 comprises the first shaft
hole 161 to which the second end of the first shaft 151 is forcibly and
integrally fitted, and a pair of wings 162 protruding from opposite sides
of the first shaft supporting bracket 160. Each. wing 162 is formed with
a screw through hole 164 to be fastened to a fastening part 115 of the
rear cover 113 by a second screw 165.

[0050] The main hinge is provided between the link 120 and the main body
101 and allows the link 120 to pivot relative to the main body 101.
Further, the main hinge comprises the second hinge hole 145 formed in the
extended part 143 of the inner cover 140, and the second shaft member 170
provided between an end of the coupler 180 and the extended part 143 of
the inner cover 140.

[0051] The second shaft member 170 comprises the second shaft 171 forcibly
fitted in the second hinge hole 145 of the inner cover 140 and rotating
integrally with the inner cover 140, a second shaft supporter 179
rotatably and frictionally supporting the second shaft 171, and a second
shaft coupling part 174 extended from the second shaft 171 toward the
coupler 180 and integrally coupled to the coupler 180.

[0052] The second shaft supporter 179 has a first end rotatably connected
to the second shaft 171, and a second end connected to the main body by a
screw or the like.

[0053] The second shaft 171 is forcibly fitted in the second hinge hole
145 formed in the extended part 143 of the inner cover 140. The second
shaft 171 is rotatably and frictionally connected to the second shaft
supporter 179. That is, the second shaft 171 is rotatably and
frictionally fitted to the second shaft supporter 179. Therefore a force
large enough to overcome a predetermined friction is needed to pivot the
link 120 relative to the main body 101. Such a predetermined friction is
used for a purpose similar to the friction between the first shaft 151
and the first shaft supporter 155, and therefore a detailed description
thereof will be omitted. Further, the second shaft 171 is formed with a
second cable through hole 172 communicating with the cable accommodating
space between the inner cover 140 and the outer cover 130. Thus, the
cable 107 passes through the first cable through hole 172 of the first
shaft 151, the cable accommodating space of the link 120, the second
cable through hole 172 of the second shaft 171 in sequence. Further, the
second shaft 171 is forcibly and integrally fitted in the second hinge
hole 145, and rotatably and frictionally inserted in the second shaft
supporter 179, thereby allowing the display part 110 to tilt about the
second shaft 171. Thus, the display part 110 can tilt about the second
hinge axis 197 formed by the second shaft 171.

[0054] Here, the second hinge axis 197 is in parallel with and spaced from
the first hinge axis 196, and is aligned with the coupler 180. That is,
when the display part 110 is tilted about the second hinge axis 197 of
the second shaft 171 of the main hinge, the coupler 180 is aligned with
the second hinge axis 197. The coupler 180 is coupled to the second shaft
coupling part 174 extended from the second shaft 171 and rotates
integrally with the second shaft 171.

[0055] The second shaft coupling part 174 extends from the second shaft
171 toward the coupler 180, and is coupled to the end of the coupler 180
shaped like a pipe. Preferably, the second shaft coupling parts 174 are
forcibly fitted to the opposite ends of the coupler 180 so as to rotate
integrally with the second shaft 171. However, the second shaft coupling
part 174 may be coupled to the coupler 180 by a screw or the like.
Further, between the second shaft coupling part 174 and the second shaft
171 is formed a bypassing opening 173 being cut to communicate with the
second cable through hole 172 of the second shaft 171. Thus, the cable
107 passing through the second cable through hole 172 is connected to the
main body 101 through the bypassing opening 173.

[0056] The locking unit 200 comprises a locking projection 201 protruding
from one of the link 120 and the display part 110 toward the other one,
and a projection holder 210 provided in the other one and elastically
locked to and released from the locking projection 201.

[0057] The locking projection 201 is provided in the pair of links 120,
respectively. However, the locking projection 201 may be provided in at
least one of the pair of links 120. Preferably, the locking projection
201 protrudes from the inner cover 140 of the link 120 toward the display
part 110. More preferably, the locking projection 201 is placed adjacent
to the second end of the link 120 connected to the main hinge. According
to an embodiment of the present invention, the locking projection 201 has
a rectangular shape, but may have a polygonal shape, an arc shape, etc.

[0058] Preferably, the projection holder 210 is placed in a lateral side
of the display part 110, corresponding to the locking projection 201.
Further, the projection holder 210 comprises a projection accommodating
part 211 formed in the lateral side of the display part 110 to allow the
display part 110 tilted relative to the link 120 to accommodate the
locking projection 201, and a holding projection 213 elastically
retracted in the projection accommodating part 211 by contacting the
locking projection 201. Further, the projection holder 210 comprises a
spring 215 elastically pushing the holding projection 213 toward the
outside of the display part 110.

[0059] The projection accommodating part 211 comprises an opening 212
opened in the back of the display part 110, and an elastic member 217
facing opposite the opening 212 and contacting the locking projection 201
past the holding projection 213 so as to prevent noise from coming out.
Further, the projection accommodating part 211 is provided symmetrically
with respect to the first hinge axis 196, forming a pair. That is,
referring to FIG. 2, the projection accommodating part 211 comprises a
pair of first projection accommodating parts 211a located in upper
opposite sides of the display part 110, and a pair of second projection
accommodating parts 211b located in lower opposite sides of the display
part 110. Further, the projection accommodating part 211 is provided with
a holding projection through part 218 through which a first part 213a of
the holding projection 213 is exposed toward the locking projection 201.
Here, the projection accommodating part 211 is preferably provided in the
rear cover 113 of the display part 110 to accommodate the locking
projection 201, but may be provided in the front cover 112.

[0060] Preferably, the first end 213a of the holding projection 213 is
smaller than the holding projection through part 218 so as to pass
through the holding projection through part 218, and has a wedge-shape to
easily contact the locking projection 201. Further, a second end 213b of
the holding projection 213 is larger than the holding projection through
part 218 so as to not pass through the holding projection through part
218, and has a spring contact part 214 grooved to easily contact the
spring 215.

[0061] The spring 215 is coupled to the display part 110, being in contact
with the second end 213b of the holding projection 213 and elastically
pushing the holding projection 213 outward from the display part 110.
Preferably, the spring 215 is coupled to the rear cover 113 of the
display part 110 and contacts the spring contact part 214, and the rear
cover 113 is provided with a spring supporter 116 to support opposite
ends of the spring 215. Further, the spring 215 is preferably a coil
spring, but may be made of an elastic material such as a flat spring, a
rubber material, etc. In this embodiment, the holding projection 213 and
the spring 215 are provided in only the second projection accommodating
parts 211b, but may be provided in only the first projection
accommodating part 211a or both the first and second projection
accommodating parts 211a and 211b.

[0062] The elastic member 217 is preferably provided in both the first and
second projection accommodating parts 211a and 211b. Further, the elastic
member 217 is preferably placed in the projection accommodating part 211,
facing opposite the opening 212. Here, the elastic member 217 contacts
the locking projection 201 elastically past the holding projection 213,
and prevents the locking projection 201 from moving. Preferably, the
elastic member 217 is made of a rubber material. Further, the elastic
member 217 is provided with an insertion part 217a to be elastically
inserted and connected into an insertion hole 219 of the projection
accommodating part 211 facing opposite to the opening 212. However, the
elastic member 217 may be a spring which contacts the locking projection
201 and prevent the noise from coming out.

[0063] Operations of the locking unit 200 will now be described with
reference to FIGS. 5 through 11.

[0064] First, the display part 110 and the link 120 are rotated with
respect to the second hinge axis 197, and changed from the closed
position (refer to FIG. 8) in which the front cover 112 is in contact
with the upper surface of the main body 101 to the opened position (refer
to FIG. 9) in which the display part 110 is opened relative to the main
body 101. The locking projection 201 of the link 120 is accommodated in
the second projection accommodating part 211b of the projection holder
210 provided in the display part 110 and rotates integrally with the
display part 110. That is, when the display part 110 is upwardly pushed
and tilted from the closed position (refer to FIG. 8) to the opened
position (refer to FIG. 9), the locking projection 201 is in contact with
the holding projection 213 and the elastic member 217 of the second
projection accommodating part 211b, so that the display part 110 does not
rotate relative to the link 120. Therefore, even if a user pushes only
the display part 110 downward, the link 120 rotates integrally with the
display part 110, so that it is convenient for the user. Further, even if
the user pushes only the display part 110, the display part 110 does not
freely rotate relative to the link 120, thereby preventing the display
part 110 from an unintentional collision with the main body 101.

[0065] The display part 110 can be tilted further from the opened position
shown in FIG. 9, that is, a lower part of the display part 110 can be
tilted forward relative to the link 120 (refer to FIG. 10). A user has to
push the display part 110 with enough force to allow the locking
projection 201 accommodated in the second projection accommodating part
211b to be elastically pushed by the holding projection 213. Thus, the
locking projection 201 moves from a locked position (refer to FIG. 5), in
which the locking projection 201 is accommodated in the second projection
accommodating part 211b and locked by the holding projection 213, to a
released position (refer to FIG. 7), in which the locking projection 201
is released from the second projection accommodating part 211b, via a
pushing position (refer to FIG. 6), in which the locking projection 201
is elastically pushing the holding projection 213.

[0066] The display part 110 can be tilted further relative to the link 120
from the position shown in FIG. 10 until the locking projection 201 is
accommodated in the first projection accommodating part 211a. Then, the
display part 110 and the link 120 can be integrally tilted relative to
the main body 101 and changed to the tablet position (refer to FIG. 11)
in which the rear cover 113 of the display part 110 is in contact with
the upper surface of the main body 101. At this time, the locking
projection 201 of the link 120 is accommodated in and pivoted integrally
with the first projection accommodating part 211a of the display part
110. That is, when the display part 110 is downwardly pushed and tilted
to the tablet position (refer to FIG. 11), the locking projection 201 is
in contact with the elastic member 217 of the first projection
accommodating part 211a, so that the display part 110 does not rotate
relative to the link 120. Therefore, even if a user pushes only the
display part 110 downward, the link 120 rotates integrally with the
display part 110, so that it is convenient for the user. Further, even if
the user pushes only the display part 110, the display part 110 does not
freely rotate relative to the link 120, thereby preventing the display
part 110 from an unwanted collision with the main body 101.

[0067] On the other hand, a process of tilting the display part 110 from
the tablet position (refer to FIG. 11) to the closed position (refer to
FIG. 8) is performed in a reverse order of the described operations.

[0068] Additionally, the portable computer according to the illustrated
embodiment of the present invention further comprises the coupler 180
coupled to the main hinge and rotating relative to the main body 101
integrally with the links 120, wherein the rotating axis of the coupler
180 is aligned with the pivoting axis of the link 120. Therefore, the
coupler 180 prevents the torsion from being generated when the pair of
second shaft members 170 may be individually rotated, so that the display
part 110 is stably tilted and prevented from being a problem. For
example, while the display part 110 is tilted relative to the main body
101, if the pair of second shaft members 170 are not simultaneously
rotated, the display part 110 is distorted and is not smoothly and stably
tilted and the LCD panel 111 may be distorted, thereby causing a problem
in the display part 110. [00067] In the foregoing embodiment, the first
shaft 151 is forcibly fitted in a first shaft hole 161 of the first shaft
supporting bracket 160 and rotates integrally with the first shaft
supporting bracket 160, and the second shaft 171 is forcibly fitted in
the second hinge hole 145 formed in the extended part 143 of the inner
cover 140 and rotates integrally with the inner cover 140. However, the
first shaft 151 and the second shaft 171 may have noncircular sections
and be integrally fitted to the first shaft hole 161 and the second hinge
hole 145, respectively.

[0069] As described above, the illustrated embodiments of the present
invention provide a portable computer having an improved structure for
convenience and stability when a display part is tilted.

[0070] Further, the illustrated embodiments of the present invention
provide a portable computer comprising a coupler coupled to a main hinge
and aligned with an axis of the main hinge, so that the display part is
stably tilted and prevented from torsion and being a problem.

[0071] Although only a few embodiments of the present invention have been
shown and described, it will be appreciated by those skilled in the art
that changes may be made in these embodiments without departing from the
principles and spirit of the invention, the scope of which is defined in
the appended claims and their equivalents.